> How do you discern that a “deepfake” (what a dumb term) is similar to you and not just similar to anyone else?

Presumably the only reason to use a deepfake of a specific person is to produce things specifically in relation to that person. Otherwise, why bother? So “is this about the individual or just coincidence?” isn’t likely to be a factor in any complaint made. This seems like a hypothetical rather than something that is likely to need answering in practice.